Free mObjects if no objects left to realloc on resize

Fixes: 134168436
Test: atest CtsOsTestCases:ParcelTest#testObjectDoubleFree
Change-Id: I82e7e8c7b4206fb45b832a71d174df45edb62710

1 files changed, 10 insertions, 4 deletions

diff --git a/libs/binder/Parcel.cpp b/libs/binder/Parcel.cpp
index 5427ff8e4c..d5cdf07444 100644
--- a/libs/binder/Parcel.cpp
+++ b/libs/binder/Parcel.cpp
@@ -2835,10 +2835,16 @@ status_t Parcel::continueWrite(size_t desired)
                 }
                 release_object(proc, *flat, this, &mOpenAshmemSize);
             }
-            binder_size_t* objects =
-                (binder_size_t*)realloc(mObjects, objectsSize*sizeof(binder_size_t));
-            if (objects) {
-                mObjects = objects;
+
+            if (objectsSize == 0) {
+                free(mObjects);
+                mObjects = nullptr;
+            } else {
+                binder_size_t* objects =
+                    (binder_size_t*)realloc(mObjects, objectsSize*sizeof(binder_size_t));
+                if (objects) {
+                    mObjects = objects;
+                }
             }
             mObjectsSize = objectsSize;
             mNextObjectHint = 0;